JPS63208342A - Loudspeaker simultaneous telephonic communication equipment - Google Patents
Loudspeaker simultaneous telephonic communication equipmentInfo
- Publication number
- JPS63208342A JPS63208342A JP4102487A JP4102487A JPS63208342A JP S63208342 A JPS63208342 A JP S63208342A JP 4102487 A JP4102487 A JP 4102487A JP 4102487 A JP4102487 A JP 4102487A JP S63208342 A JPS63208342 A JP S63208342A
- Authority
- JP
- Japan
- Prior art keywords
- output
- amplifier
- input
- signal
- speaker
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002131 composite material Substances 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract 4
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000003786 synthesis reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 239000013256 coordination polymer Substances 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［技術分野］
本発明はハンドセットを用いずにマイクロフォンとスピ
ーカを用いて通話ので終る電話機の拡声同時通話装置に
関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a telephone loudspeaker simultaneous call device that allows calls to be completed using a microphone and a speaker without using a handset.
［背景技術］
通常この種の拡声通話式電話機においては、第４図に示
すように、音声によって送話と受話が自動的に切り替え
られる音声スイッチ回路が使用されている。同図におい
て、マイクロフォンＭｅの出力が増幅器Ａ１で増幅され
、その送話レベルが整流平滑回路ＤＳ、を介して比較器
ＣＰの非反転側に入力され、また線路り、、Ｌ２からの
受話入力は増幅器Ａ、で□増幅されたのち、整流平滑回
路ＤＳ２を介して比較器ＣＰの反転側に入力されている
。いま送話レベルが大きくなると、比較器ＣＰの出力が
Ｈレベルとなって、抵抗Ｒ１とコンデンサＣ１とで設定
されている短い時定数でＸ点の電位が上がるので、送話
側のアナログスイッチＡＳ。[Background Art] Typically, this type of loudspeaker telephone set uses a voice switch circuit that automatically switches between sending and receiving calls based on voice, as shown in FIG. In the figure, the output of the microphone Me is amplified by an amplifier A1, and its transmitting level is input to the non-inverting side of the comparator CP via a rectifying and smoothing circuit DS, and the receiving input from the line L2 is After being amplified by the amplifier A, the signal is input to the inverting side of the comparator CP via the rectifying and smoothing circuit DS2. Now, when the transmitting level increases, the output of the comparator CP becomes H level, and the potential at point X rises with a short time constant set by the resistor R1 and capacitor C1. .
がオンし、受話側のアナログスイッチＡＳ２はインバー
タエ、を介してオフとなる。次に送話入力がなくなると
、コンデンサＣ１と抵抗Ｒ２とで設定されている比較的
長い時定数でＸ点の電位が下がり、アナログスイッチＡ
Ｓ 、、Ａ Ｓ ２の開閉状態が逆転する。なおり１
はこの時の逆流阻止用ダイオードである。こうしてマイ
クロフォンＭＣ→増幅器ＡＩ→アナログスイッチＡＳ、
→増幅器Ａ２→通話回路網ＣＬ→増幅器Ａ、→アナログ
スイッチＡＳ２→増１１１ｇ器Ａ３→スピーカＳＰ→マ
イクロフォンＭＣの閉回路のループゲインを送話、受話
を通じて常に１以下に抑え、それによってスピーカから
マイクロフォンへの回り込みによるハウリングを防止す
るようにしたものである。is turned on, and analog switch AS2 on the receiver side is turned off via an inverter. Next, when the transmitter input disappears, the potential at point X decreases with a relatively long time constant set by capacitor C1 and resistor R2, and analog switch A
The open/closed states of S , , A S 2 are reversed. Naori 1
is the backflow blocking diode at this time. In this way, microphone MC → amplifier AI → analog switch AS,
→ Amplifier A2 → Telephone network CL → Amplifier A → Analog switch AS2 → Amplifier A3 → Speaker SP → Microphone MC The loop gain of the closed circuit of the microphone MC is always kept below 1 throughout transmitting and receiving calls, and thereby the microphone is connected from the speaker to the microphone. This is designed to prevent howling caused by looping around.
しかしこの従来の拡声通話方式は、互いに自局側が話し
ている時には相手側の音声が殆ど聞こえなくなるので完
全な同時通話にはならず、自局側で話を始めると相手の
声が途切れてしまったり、あるいは自局が話を終了した
直後の相手の声の頭が切れたりするという欠点があった
。However, with this conventional loudspeaker system, when both parties are talking, the other party's voice can hardly be heard, so it is not possible to have a completely simultaneous conversation, and when the own party starts talking, the other party's voice is interrupted. There was a drawback that the other party's voice would become incoherent, or the other party's voice would be cut off immediately after the player's own station had finished speaking.
［発明の目的］
本発明は上記の問題点に鑑み為されたものであり、その
目的とするところは、話し手は話しながら同時に相手側
の音声を耳で聞くことができ、しかもハウリングを完全
に防止することがで終る拡声同時通話装置を提供するに
ある。[Object of the Invention] The present invention has been made in view of the above-mentioned problems, and its purpose is to enable a speaker to listen to the voice of the other party while speaking, and to completely eliminate howling. The purpose of the present invention is to provide a public address simultaneous communication device that prevents the use of multiple telephone calls.
［発明の開示］
しかして本発明による拡声同時通話装置は、受話出力を
ほぼゲイン１で送話入力へ正帰還して該合成信号を一方
の入力とし受話出力のみを他方の入力としだ差動増幅器
の出力を送話出力とした点に特徴を有するものであって
、スピーカからマイクへの回り込みによるハウリングを
防止するために、受話出力をゲイン１で積極的に送話入
力に正帰還して、差動増幅器により受話出力のみの他入
力と相殺するようにしたものである。[Disclosure of the Invention] However, the simultaneous loudspeaker communication device according to the present invention positively feeds the receiving output to the transmitting input with a gain of approximately 1, uses the synthesized signal as one input, and uses only the receiving output as the other input. This device is characterized in that the output of the amplifier is used as the transmitting output, and in order to prevent howling due to feedback from the speaker to the microphone, the receiving output is positively fed back to the transmitting input with a gain of 1. , a differential amplifier is used to cancel out only the receiving output with other inputs.
「実施例」
第１図は本発明の一実施例を示したもので、回線りより
通話回路網ＣＬを介して入力する受話信号が第１の増幅
器ＡＩで増幅され、第１の増幅器Ａ、の出力がゲイン１
の第２の増幅器Ａ２を介してマイク兼用スピーカＭＳに
入力されており、また第１の増幅器ＡＩの出力を一方の
入力とし、マイク兼用スピーカＭＳを他方の入力とする
差動増幅器ＤＡの出力が通話回路網ＣＬを介して回線り
に送出されるように構成されたものである。Embodiment FIG. 1 shows an embodiment of the present invention, in which a reception signal inputted from a line via a telephone communication network CL is amplified by a first amplifier AI, a first amplifier A, The output of is gain 1
is inputted to the microphone/speaker MS via the second amplifier A2, and the output of the differential amplifier DA which takes the output of the first amplifier AI as one input and the microphone/speaker MS as the other input. It is configured to be sent to the line via the communication network CL.
いま第１図において、相手側が話している時には、受話
信号は通話回路網ＣＬを通り、第１の増幅器Ａ１で増幅
されたのち、第２の増幅器Ａ２すなわちゲイン１のバッ
ファ増幅器を経て、マイク兼用スピーカＭＳを駆動する
。この受話出力は同時に差動増幅器ＤＡの一方の入力端
子ａにも入力されるが、その信号は差動増幅器ＤＡの他
方の入力端子すに入力されている第１の増幅器Ａ１の出
力と同一であるために、差動増幅器ＤＡの出力はゼロと
なる。次に相手側の話し中に自局側が話を始めた場合に
は、差動増幅器ＤＡの入力端子すに送話入力と受話出力
の合成信号が入力するが、このうち受話出力のみが入力
端子ａからの信号によって打ち消されるために、差動増
幅器ＤＡの出力端子Ｃには送話入力のみが増幅されて出
力され、これが通話回路網ＣＬを通って回線りに送出さ
れるものである。In Fig. 1, when the other party is speaking, the received signal passes through the communication circuit CL, is amplified by the first amplifier A1, and then passes through the second amplifier A2, that is, a buffer amplifier with a gain of 1, and is sent to the microphone. Drive speaker MS. This reception output is also input to one input terminal a of the differential amplifier DA at the same time, but the signal is the same as the output of the first amplifier A1 which is input to the other input terminal a of the differential amplifier DA. Therefore, the output of the differential amplifier DA becomes zero. Next, when the local station starts talking while the other party is talking, a composite signal of the transmitting input and the receiving output is input to the input terminal of the differential amplifier DA, but only the receiving output is input to the input terminal. Since it is canceled by the signal from a, only the transmitting input signal is amplified and outputted to the output terminal C of the differential amplifier DA, and this is sent to the line through the communication network CL.
上記の構成によれば、自局と相手局とが同時に話してい
ても、従来のように受話信号が遮断されないので違和感
がなく、また送話出力が通話回路網ＣＬがら受話回路側
に漏洩しても、差動増幅器ＤＡによって送話回路への正
帰通分が相殺されるために漏洩信号に対して閉ループが
形成されず、ハウリングの発生が阻止されるものである
。According to the above configuration, even if the local station and the other station are talking at the same time, there is no discomfort because the receiving signal is not blocked as in the conventional case, and the transmitting output does not leak from the communication circuit network CL to the receiving circuit side. However, since the positive feedback to the transmitting circuit is canceled by the differential amplifier DA, a closed loop is not formed for the leakage signal, and the occurrence of howling is prevented.
第２図（、）は他の実施例を示したもので、回線りより
通話回路網ＣＬを介して入力する受話信号が増幅器Ａ、
で増幅され、この増幅出力によってスピーカＳＰが駆動
されており、このスピーカＳＰの前方と後方には、同図
（ｂ）に示すように、はぼ同一距離の所に２個のマイク
ＭＣ，、ＭＣ２が配置されて、両マイクＭＣ，，ＭＣ２
の出力が差動増幅器ＤＡの割入力となっている。そして
この差動増幅器ＤＡの出力が送話側の増幅器Ａ３及び通
話回路［ＣＬを介して回線りに出力されている。FIG. 2(,) shows another embodiment in which the receiving signal input from the line via the telephone communication network CL is transmitted to the amplifier A,
This amplified output drives a speaker SP, and in front and behind this speaker SP, as shown in FIG. MC2 is placed and both microphones MC,,MC2
The output of is the splitting input of the differential amplifier DA. The output of the differential amplifier DA is output to the line via the transmitting side amplifier A3 and the communication circuit [CL.
いま第２図（ａ）において、相手局のみが話している時
には、通話回路＃４ｃＬを通って入力する受話信号は増
幅器Ａ、で増幅されてスピーカＳＰから出力され、これ
が両マイクＭＣ，，ＭＣ２に同等に入力されるので、差
動増幅器ＤＡによって互いに打ち消され送話出力はゼロ
となる。次に自局のみが話している時には、マイクＭＣ
，からのみ出力が出て、マイクＭＣ２はスピーカＳＰの
裏側にあるので殆ど出力が出ず、従って差動増幅器ＤＡ
からはマイクＭＣ，の信号のみが出力されて、通話回路
網ＣＬを介して回線りへ送出される。更に両局が同時に
話している場合には、前側のマイクＭＣ，には送話入力
と受話出力の合成信号が入力され、そのうち受話出力は
同一の音声信号が裏側のマイクＭ Ｃ２にも入力されて
いるので、差動増幅器ＤＡによって打ち消され、マイク
ＭＣ，からの信号のみが差動増幅器ＤＡから出力される
ことになる。Now, in FIG. 2(a), when only the other station is talking, the reception signal input through the communication circuit #4cL is amplified by the amplifier A and output from the speaker SP, and this is transmitted to both microphones MC, MC2. Since the two signals are inputted equally to each other, they cancel each other out by the differential amplifier DA, and the transmitting output becomes zero. Next time when only your own station is talking, the microphone MC
Since the microphone MC2 is located on the back side of the speaker SP, almost no output is output, so the differential amplifier DA
Only the signal from the microphone MC is outputted from the microphone MC, and sent to the line via the telephone communication network CL. Furthermore, when both stations are talking at the same time, a composite signal of the transmitting input and the receiving output is input to the front microphone MC, and the same audio signal of the receiving output is also input to the rear microphone MC2. Therefore, the signal from the microphone MC is canceled by the differential amplifier DA, and only the signal from the microphone MC is output from the differential amplifier DA.
次に第３図の実施例は、第２図の回路を改良したもので
あり、両マイクＭＣ，，ＭＣ２は設置場所やその他の条
件により、必ずしも音声入力のレベルや位相が同一にな
るとは限らないので、レベル調節回路ＬＣ及び位相制御
回路ＰＣにより、調節できるようにしたものである。Next, the embodiment shown in Fig. 3 is an improved version of the circuit shown in Fig. 2, and the level and phase of the audio input may not necessarily be the same for both microphones MC, MC2 depending on the installation location and other conditions. Therefore, the level adjustment circuit LC and the phase control circuit PC can be used to make adjustments.
［発明の効果１
本発明装置は上述のように、受話出力をほぼゲイン１で
送話入力へ正帰還して、その合成信号を一方の入力とし
、受話出力のみを他方の入力としだ差動増幅器の出力を
送話出力としたものであって、スピーカからマイクへの
回り込みによる発振を防止するために、受話出力を積極
的に送話入力に正帰還し、差動増幅器により送話出力の
みの値入力と相殺するようにしたものであるから、自局
、と相手局とが同時に話していても、従来のように相手
の話が途切れたり頭切れしたりする虞れがなく、また送
話出力が通話回路網がら受話回路側に漏洩しても、漏洩
信号に対して閉ループが形成されないのでハウリングが
発生する虞れがないという利点がある。[Effect of the invention 1] As described above, the device of the present invention positively feeds the receiving output to the transmitting input with a gain of approximately 1, uses the combined signal as one input, and uses only the receiving output as the other input, and uses a differential The output of the amplifier is used as the transmitting output, and in order to prevent oscillation due to looping from the speaker to the microphone, the receiving output is positively fed back to the transmitting input, and a differential amplifier is used to output only the transmitting voice. Since this is designed to offset the input value of , even if the own station and the other station are talking at the same time, there is no risk of the other party's conversation cutting off or cutting off the beginning, and there is no need to worry about sending a message. Even if the speech output leaks from the communication circuit network to the receiving circuit side, there is an advantage that there is no possibility of howling occurring because a closed loop is not formed for the leakage signal.
第１図は本発明装置の一実施例を示すブロック図、第２
図（ａ）は他の実施例のブロック図、（ｂ）は同上の要
部断面図、第３図は更に他の実施例のブロック図、第４
図は従来例のブロック図である。
Ｌ・・・回線、ＭＣ，、ＭＣ２・・・マイク、ＳＰ・・
・スピーカ、ＭＳ・・・マイク兼用スピーカ、Ａ ＋
ｖ Ａ ２１ Ａ ３・・・増幅器、ＤＡ・・・差動増
幅器、ＣＬ・・・通話回路網。
代理人 弁理士 石 １）長 七
８Ｐ・・・スピーカ
第１ 図 ＤＡ・・・差動増幅器２ｃ／）
’１
量
■
夏
１；：５１１．：１：
ΣFIG. 1 is a block diagram showing one embodiment of the device of the present invention, and FIG.
Figure (a) is a block diagram of another embodiment, (b) is a cross-sectional view of the same essential parts as above, Figure 3 is a block diagram of still another embodiment, and Figure 4 is a block diagram of another embodiment.
The figure is a block diagram of a conventional example. L...Line, MC,, MC2...Microphone, SP...
・Speaker, MS...Speaker that also serves as microphone, A +
v A 21 A 3...Amplifier, DA...Differential amplifier, CL...Telephone circuit network. Agent Patent Attorney Ishi 1) Long 78P...Speaker Figure 1 DA...Differential Amplifier 2c/) '1 Quantity ■ Summer 1;:511. :1:Σ
Claims (3)
該合成信号を一方の入力とし受話出力のみを他方の入力
とする差動増幅器の出力を送話出力として成る拡声同時
通話装置。(1) A simultaneous loudspeaker communication system consisting of a differential amplifier whose output is positive feedback to the transmitting input with a gain of approximately 1, the composite signal being used as one input, and only the receiving output being used as the transmitting output. .
第１の増幅器で増幅し、第１の増幅器の出力をゲイン１
の第２の増幅器を介してマイク兼用スピーカに接続し、
第１の増幅器の出力を一方の入力としマイク兼用スピー
カを他方の入力とする差動増幅器の出力を上記通話回路
網を介して回線に送出して成る特許請求の範囲第１項記
載の拡声同時通話装置。(2) The received signal input from the line via the communication circuit network is amplified by the first amplifier, and the output of the first amplifier is
Connect to the microphone/speaker via the second amplifier of
A simultaneous sound amplification system according to claim 1, wherein the output of a differential amplifier having the output of the first amplifier as one input and the microphone-cum-speaker as the other input is sent to the line via the communication circuit network. Telephone device.
増幅器を介してスピーカに出力し、スピーカの前方と後
方に配置した２個のマイクを差動増幅器の両入力として
、差動増幅器の出力を上記通話回路網を介して回線に送
出して成る特許請求の範囲第１項記載の拡声同時通話装
置。(3) The reception signal that is input from the line via the communication circuit network is output to the speaker via the amplifier, and the two microphones placed in front and behind the speaker are used as both inputs of the differential amplifier. 2. The simultaneous loudspeaker telephone call apparatus according to claim 1, wherein the output is sent to a line via the telephone call network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4102487A JPS63208342A (en) | 1987-02-24 | 1987-02-24 | Loudspeaker simultaneous telephonic communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4102487A JPS63208342A (en) | 1987-02-24 | 1987-02-24 | Loudspeaker simultaneous telephonic communication equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63208342A true JPS63208342A (en) | 1988-08-29 |
Family
ID=12596827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4102487A Pending JPS63208342A (en) | 1987-02-24 | 1987-02-24 | Loudspeaker simultaneous telephonic communication equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63208342A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05315993A (en) * | 1991-08-31 | 1993-11-26 | Koichi Mino | Communication system having speaker to be used as microphone in common |
| WO2007060753A1 (en) * | 2005-11-25 | 2007-05-31 | Matsushita Electric Works, Ltd. | Voice information processing device, and wiring system using the same device |
| JP2007228301A (en) * | 2006-02-23 | 2007-09-06 | Matsushita Electric Works Ltd | Telephone call device |
| EP3531717A1 (en) * | 2018-02-26 | 2019-08-28 | Sonion Nederland B.V. | An assembly of a receiver and a microphone |
| EP3531720A1 (en) * | 2018-02-26 | 2019-08-28 | Sonion Nederland B.V. | An assembly of a receiver and a microphone |
-
1987
- 1987-02-24 JP JP4102487A patent/JPS63208342A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05315993A (en) * | 1991-08-31 | 1993-11-26 | Koichi Mino | Communication system having speaker to be used as microphone in common |
| WO2007060753A1 (en) * | 2005-11-25 | 2007-05-31 | Matsushita Electric Works, Ltd. | Voice information processing device, and wiring system using the same device |
| KR100975262B1 (en) | 2005-11-25 | 2010-08-11 | 파나소닉 전공 주식회사 | Voice information processing device, and wiring system using the same device |
| JP2007228301A (en) * | 2006-02-23 | 2007-09-06 | Matsushita Electric Works Ltd | Telephone call device |
| JP4640209B2 (en) * | 2006-02-23 | 2011-03-02 | パナソニック電工株式会社 | Telephone device |
| EP3531717A1 (en) * | 2018-02-26 | 2019-08-28 | Sonion Nederland B.V. | An assembly of a receiver and a microphone |
| EP3531720A1 (en) * | 2018-02-26 | 2019-08-28 | Sonion Nederland B.V. | An assembly of a receiver and a microphone |
| CN110198502A (en) * | 2018-02-26 | 2019-09-03 | 索尼昂荷兰有限公司 | The component of receiver and microphone |
| US10951999B2 (en) | 2018-02-26 | 2021-03-16 | Sonion Nederland B.V. | Assembly of a receiver and a microphone |
| CN110198502B (en) * | 2018-02-26 | 2022-08-09 | 声扬荷兰有限公司 | Assembly of receiver and microphone |
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